FIELD: construction of railways. SUBSTANCE: rail chair is preferably made of flexible plastic or rubber and has two opposite sides; at least one of opposite sides has surface at least partially dependent on simple and/or composite trigonometric sine and/or cosine function so that at least part of one of two opposite sides of flexible chair has projections and depressions alternately arranged and gradually turning one into other. EFFECT: improved vibration damping characteristics. 4 cl, 10 dwg
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